atanh(), atanhf()

Compute an inverse hyperbolic tangent

Synopsis:

#include <math.h>

double atanh( double x );

float atanhf( float x );

Library:

libm

Description:

These functions compute the inverse hyperbolic tangent (specified in radians) of x.

Returns:

The inverse hyperbolic tangent of x.

Examples:

#include <stdio.h>
#include <math.h>
#include <stdlib.h>

int main( void )
{
    printf( "%f\n", atanh( 0.5 ) );
    return EXIT_SUCCESS;
}

produces the output:

0.549306

Classification:

atanh() is standard Unix; atanhf() is ANSI (draft)

See also:

acosh(), asinh(), errno, tanh()